Humidity Control in the Aerospace Industry

Q: Why is humidity management vital in aerospace cleanrooms?

In cleanrooms used for satellite assembly, precision optics, and microelectronics, uncontrolled humidity can lead to static discharge, particle attraction, or contamination. Maintaining humidity between 40–55% RH balances electrostatic discharge protection with contamination control, ensuring the integrity of ultra-sensitive components.

Q: Why is humidity control necessary in wind tunnels and test chambers?

In aerodynamic and environmental testing, humidity variations affect air density, flow characteristics, and temperature control. Precise humidity regulation ensures consistent and repeatable test conditions, critical for accurate performance measurements of aircraft structures, sensors, and engines.

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Benefits

The production process in the aviation industry is heavily dependent on sufficient humidity between 40% and 60%. Humidity that is too low or too high can cause damage and faults in electronic aircraft components, provide an inadequate environment for the polymerization of composite materials, sealants, coatings, and welds, and compromise safety in your facility and in the air. Ensuring adequate air humidification in your production facility increases your throughput, improves product quality, and extends the service life of aircraft.

Prevention of Electrostatic Discharge (ESD)

A relative humidity between 40% and 60% reduces the risk of dangerous electrical discharges and electronic failures in avionics and electronic systems.

Avoiding Desoldering of Fragile Components

The right humidity contributes to the efficiency of wave soldering and surface mount technology (SMT) in aircraft construction.

Painting and Coating in the Aviation Industry

Ensuring sufficient and constant humidity between 40% and 60% is essential for successful painting and coating applications.

Humidity Control in the Aerospace Industry

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Ensuring High-Quality Manufacturing of Avionics and Electrical Components

A constant humidity level of 40-60% RH during the manufacture of avionics components is essential for product quality assurance, reliability, and safety. Adequate humidity helps eliminate the risk of ESD and reduces the likelihood of costly electronic malfunctions, improves the safety of the aircraft and flight system, and ensures that flight schedules and delivery dates are met.

Humidity Control for the Application of Paints and Coatings in the Aviation Industry

The painting of aircraft requires reduced and strict stable conditions in order to achieve an even coating. Maintaining relative humidity between 40% and 60% is ideal for paint adhesion.

Avoiding desoldering and fragile components

The right humidity contributes to the efficiency of the wave soldering process and surface mount technology (SMT) in aircraft construction. Without sufficient humidity, the solder paste can dry out, preventing the solder joints from becoming sufficiently strong and causing the product to have weak points. This can shorten the service life of aircraft and lead to short circuits and malfunctions. Too low humidity can also cause aircraft electronics to become sensitive, components to break, or damage or malfunctions to occur in the air.

Use Cases

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Projects and References

Spirit Aero System

Spirit AeroSystems is one of the world's largest manufacturers of aerostructures for commercial airplanes, defense platforms, and business/regional jets. With expertise in aluminum and advanced composite manufacturing solutions, the company's core products include fuselages, integrated wings and wing components, pylons, and nacelles. Also, Spirit serves the aftermarket for commercial and business/regional jets. Headquartered in Wichita, Kansas, Spirit has facilities in the U.S., U.K., France, Malaysia and Morocco.

AstroNova

AstroNova (formerly Astro-Med, Inc.) is a global leader in developing and applying data visualization technologies in products serving industrial, packaging, aerospace, and defense markets. It applies its data visualization technology to create products that deliver accuracy, efficiency, and performance across a broad range of end-user markets. Its innovation, coupled with exceptional responsiveness and technical support, creates solutions that make it easy for users to capture, read, process, and print data.

Boeing

The Boeing Company is an American multinational corporation that designs, manufactures, and sells airplanes, rotorcraft, rockets and satellites. It also provides leasing and product support services. Boeing is among the largest global aircraft manufacturers, is the second-largest defense contractor in the world based on 2013 revenue, and is the largest exporter in the United States by dollar value. Boeing stock is a component of the Dow Jones Industrial Average.

BALL Aerospace

Ball Aerospace Technologies Corp. is an American manufacturer of spacecraft, components, and instruments for national defense, civil space and commercial space applications. The company is a wholly owned subsidiary of Ball Corporation, with primary offices in Boulder and facilities in Broomfield and Westminster in Colorado, with smaller offices in New Mexico, Ohio, Northern Virginia, Missouri, and Maryland.

Boeing in MO

The Boeing Company in St. Louis Missouri, is part of the American multinational corporation Boeing that designs, manufactures, and sells airplanes, rotorcraft, rockets, and satellites worldwide. The company also provides leasing and product support services.

L3

L3 Harris technologies, Inc. is an American technology company, defense contractor and information technology services provider.

Orbital ATK

As a global leader in aerospace and defense technologies, Orbital ATK designs, builds and delivers space, defense and aviation-related systems to customers around the world both as a prime contractor and as a merchant supplier.

Crane Aerospace & Electronics

Crane Aerospace Electronics delivers innovative systems, components, and services for commercial aircraft, defense platforms, and space systems which have proven reliability in mission-critical environments. Products and services are organized into six integrated solutions: Cabin Systems, Electrical Power Solutions, Fluid Management Solutions, Landing Systems, Microwave Solutions, and Sensing Components Systems."

Northrop Grumman

Northrop Grumman solves the toughest problems in space, aeronautics, defense and cyberspace to meet the ever evolving needs of their customers worldwide. With 90,000 employees Defining Possible every day using science, technology and engineering to create and deliver advanced systems, products and services.

CFAN

Formed in 1993, CFAN is a 50/50 Joint Venture between GE Aviation and SNECMA of France. The partnership was created to introduce composite fan blades in a GE90 Engine that powers the Boeing 777. It has leveraged the success of this product to introduce additional fan blades on the GEnx Engines that power the Boeing 787 and Boeing 747-8.

YEG Airport Flight Simulator training facilities

YEG is Canada’s fifth busiest airport and largest major airport by land size. It is managed by Edmonton Airports, a community-based, financially independent and non-profit corporation.

Luke Air Force Base

Luke AFB is a major training base of the Air Education and Training Command (AETC), training pilots in the F-16 Fighting Falcon.

PCC Airfoils

Current aerospace trends have placed a premium on engine performance and fuel efficiency and, since performance and fuel efficiency both increase as the gas temperature inside the engine increases - this has created a need for complex aerodynamic turbine airfoils that operate at higher service temperatures. PCC Airfoils, a leading producer of these components, has developed highly automated casting furnaces and investment casting processes for the manufacture of blades and vanes.

NASA

The National Aeronautics and Space Administration (NASA) is the United States government agency that is responsible for the civilian space program as well as for aeronautics and aerospace research.

Kennedy Space-Center, Cape Canaveral

The John F. Kennedy Space Center is NASA's space station on Merritt Island in Florida. All manned space flights of the United States were launched from December 1968 until July 2011 - first the Apollo missions and from 1981 until 2011 the space shuttles, some of which also returned. The total area of the Kennedy Space Center comprises almost 570 square kilometers, in which 17,000 people work. Hundreds of thousands of visitors flock to the KSC Visitor Complex every year. Since June 2013, the space shuttle Atlantis has tallied among the highlights of the visitor center that can be admired as a museum piece. Condair's RS steam humidifier ensures optimal indoor humidity.

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Frequently Asked Questions

Why is humidity management vital in aerospace cleanrooms?

Why is humidity control necessary in wind tunnels and test chambers?

Why is humidity control important during aircraft painting and coating operations?

Paint application and curing are strongly affected by humidity levels. High humidity can cause blistering, poor adhesion, or uneven coating, while overly dry air can accelerate solvent evaporation, leading to surface defects. Maintaining optimal humidity (typically 40–60% RH) ensures smooth finishes, proper curing, and long-term corrosion protection of aircraft surfaces.

Why is dehumidification required during aircraft storage and maintenance?

When aircraft are parked or stored, especially in humid environments, excess moisture can cause corrosion, mold growth, and electronic component degradation. Dehumidification systems or dry air storage protect sensitive avionics, airframes, and internal components by maintaining low humidity levels (often below 40% RH). This helps preserve the aircraft’s condition, reduces maintenance costs, and extends service life.

How does humidity control affect aerospace manufacturing and testing?

In aerospace manufacturing, precise humidity control is critical for materials like composites, adhesives, and coatings, which can absorb moisture and alter performance. Controlled humidification and dehumidification ensure dimensional stability, proper curing of resins, and accurate assembly tolerances. In testing facilities (e.g., wind tunnels or environmental chambers), maintaining specific humidity levels ensures reliable and repeatable results.